What is air pressure?
Air pressure is measured using a tool called a barometer. There are a few different units that can be used to express the air pressure; these are...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough...
What is air? It has no colour, smell or taste. We can feel it. When it moves, it becomes wind. Air is important to the world. People need it. Animals need it. Plants need it too. So we must keep the air clean and fresh. Don't smoke. Don't drive to school or work if you...
It is a mixture of different gases可知正确答案.故答案为C.(4).【答案】A【解析】由原文第三段的If 1000 dots can represent the air, then 776 of them are nitrogen, 210 are oxygen, 11 are argon可知正确答案.故答案为A. 结果一 题目 2.阅读理解。What is air? Air is not just one gas. ...
Why is air pollution such an important issue today?Click to find out New Word: Ambient Air Pollution It is outdoor air pollution, usually caused by emissions from transportation, power generations, agriculture, and open burning. The chemicals in Ambient Air Pollution is different from that of in...
“In this last case, it is called clear-air turbulence, and it can be difficult to avoid because it doesn’t show up on the weather radar in the flight deck.” “Clear air turbulence is air movement created by atmospheric pressure, jet streams, air around mountains, cold or warm weather...
have recently gained recognition as pollutants by some scientists. Others recognize the gas as being essential to life and therefore incapable of being classed as a pollutant.参考:Air pollution is a chemical physical (e.g. particulate matter)or biological agent that modifies the natural ...
We can't see it but we can feel it. Air is important to us. Without air, we can't be alive for a few minutes. However, the air is very dirty now, be- cause the smoke from cars, buses and factories makes the air dirty. We should plant more trees to keep the air clean. W...
六、根据上下文和首字母提示.完成对话。 A: The air is so 1. d irty___ today! What's the matter 2. w ith__ our city? B: There 3. is ___ a lot of smoke. It 4. m akes __ the air not clean. A: I see. Where 5. d oes___ the smoke come from? B: Some smoke ...
一、由感叹词what引导的感叹句。1.① What+a/an+（形容词）+单数可数名词+主语+谓语！② What+名词词组+主语+谓语！如: What a fine day it is!2. What+(形容词）+可数名词复数或不可数名词+主语+谓语!如: What kind women they are!What nice music it is!二、由How引导的感叹句。（...